Transient absorption polarization measurements report on the orientation of the transition dipole moment relative to the excitation dipole moment, and it has been employed to study the excited-state dynamics in polypyridylRu(II) and Os(II) complexes following photoexcitation to a metal-to-ligand charge transfer (MLCT) state.  We found that the anisotropy decay rates were (5ps)-1 and (50ps)-1 in [Ru(bpy)3]2+ in acetonitrile consistent with previous reports.  Our previous studies on photochromic ruthenium and osmiumsulfoxide complexes indicated an excited state absorptionascribedto S(O) pp? Ru3+Or Os3+dp ligand-to-metal charge transfer (LMCT). We will report on our polarization anisotropy studies of these complexes with an aim to understand the motion of the sulfoxide along the triplet excited state potential energy state following excitation.

Femtosecond transient absorption anisotropy study on photochromic ruthenium and osmium sulfoxide complexes

247th National Meeting (2014)

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